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Reply to @apps@toot.fedilab.app
silverpill@silverpill@mitra.social (2026-06-13 06:18:57)
@apps I wrote this FEP: https://codeberg.org/fediverse/fep/src/branch/main/fep/f06f/fep-f06f.md
Object observer is an ActivityPub actor that can be followed to receive object updates.
However, I never implemented it. Pulling context and replies is often enough.
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Fedilab Apps@apps@toot.fedilab.app (2026-06-13 06:36:14)
@silverpill
Thanks, I read your FEP. The main difference is that the Follow targets the Note directly, with no observer actor in between. It also adds two conditions: the author must be indexable, so consent is explicit, and the Follow uses endTime because a thread is short-lived. On my side, Holos falls back to polling the replies collection when a server ignores the Follow, so it keeps working everywhere.
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silverpill@silverpill@mitra.social (2026-06-13 06:52:13)
@apps ActivityPub's Follow activity is intended to be used on actors: https://www.w3.org/TR/activitypub/#follow-activity-outbox.
This is one of the reasons I proposed that "observer" actor. Another option is to use a custom activity (e.g. Watch).